Help on accugroove jr cab

Having the bottom 12" speaker fail i need some help on a replacement,
what ive took out wheather its correct or not is a eminence 8 ohm 250 watt a neo deltalight (maybe wrong spelling) speaker, and as its a tuned cab which or what replacement do i look for is what im hoping you guys can help me on ? any ideas

i expected it to be a 400 watt speaker but i may be wrong, any one enlighten me more please ?